N. Weston, Dennis Premoli, Thomas Childerhouse, Oliver Levano Blanch, Martin Jackson
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引用次数: 0
摘要
气体雾化的 Ti-6Al-4V 粉末被归类为不符合增材制造 (AM) 标准的粉末,通过现场辅助烧结技术 (FAST) 进行了固化。通过高于或低于 β 传递温度的 FAST 处理,生产出直径为 250 毫米、具有片状或双峰微结构的全致密圆盘。通过测试 "原 FAST "状态下的全尺寸试样,对静态和动态机械性能进行了评估。两种加工条件下的材料在屈服/拉伸强度和伸长率方面都超过了 ASTM Ti-6Al-4V 粉末冶金的要求。此外,在低于 β 传递温度下加工的圆盘边缘材料符合 ASTM 对锻造 Ti-6Al-4V 的要求。疲劳性能也优于传统加工的 Ti-6Al-4V。这项工作证明,剩余的 AM 粉末可以通过一步式 FAST 工艺成功回收,并使人们相信这种 ASTM 等级的材料可以在静态和动态载荷条件下用于各种应用,这将提高 AM 行业的可持续发展能力。
Assessing the mechanical properties of out-of-specification additive manufacturing Ti-6Al-4V powder recycled through field-assisted sintering technology (FAST)
A gas atomised Ti-6Al-4V powder, classified as out-of-specification for additive manufacturing (AM), was consolidated via Field-Assisted Sintering Technology (FAST). Fully dense 250 mm diameter discs with lamellar or bimodal microstructures were produced by FAST processing either above or below the β-transus temperature. Static and dynamic mechanical properties were assessed by testing full-size specimens in the ‘as-FAST’ condition. Material from both processing conditions exceeded the ASTM Ti-6Al-4V powder metallurgy requirements for yield/tensile strength and elongation. Furthermore, material from the edge of the disc processed below the β-transus temperature meets ASTM requirements for wrought Ti-6Al-4V. Fatigue performance also compared favourably with conventionally processed Ti-6Al-4V. This work establishes that surplus AM powders can be successfully recycled via the one-step FAST process and provides confidence that this ASTM-grade material can be used in a range of applications under both static and dynamic loading, which will improve the sustainability credentials of the AM sector.
期刊介绍:
Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.